A sparse routing coil structure for a magnetic coil in a wireless charging system is disclosed. The sparse routing coil structure may include a magnetic coil routed by turns of a wire and a turn spacing S between adjacent turns of the wire. The turn spacing S may be a space between adjacent turns of the wire, and a turn width is denoted as W. A ratio of W/S may be not larger than 10.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A wireless charging system comprising a transmitter and a receiver, wherein the transmitter includes: a power amplifier accepting an power input; and a power transmitter connected to the power amplifier, and comprising a transmitter coil, the receiver includes: a power receiver comprising a receiver coil, wherein the transmitter coil and the receiver coil are magnetically coupled with each other, and each having a sparse routing coil structure, comprising: a magnetic coil having a first end and a second end, and routed by a plurality of turns of a wire at a routing plane, wherein each of the plurality of turns of the wire has a diameter different with a diameter of any of the rest of the plurality of turns, wherein a ratio of W/S is not larger than 10, S is a turn spacing representing an edge-to-edge distance between adjacent turns of the wire, W is a turn width representing a width of the wire, and wherein the first end and the second end are elicited from one of the plurality of turns with a smallest diameter and one of the plurality of turns with a largest diameter, respectively, and extending along a same direction in the routing plane.
2. The wireless charging system in claim 1 , wherein each magnetic coil includes a solid wire, the turn width W is a diameter of the wire.
3. The wireless charging system in claim 1 , wherein each magnetic coil has a substantially circular shape.
4. The wireless charging system in claim 1 , wherein each magnetic coil has an outer diameter of 48-52 mm.
5. The wireless charging system in claim 1 , wherein each magnetic coil has an inner diameter of 23-27 mm.
6. The wireless charging system in claim 1 , wherein each magnetic coil has 9-11 turns.
7. The wireless charging system in claim 1 , wherein the turn spacing S is 0.55-0.75 mm.
8. The wireless charging system in claim 1 , wherein the wire is made of copper, and has a turn width W of 0.5-0.7 mm.
9. The wireless charging system in claim 1 , wherein each magnetic coil includes a Litz wire including stranded wires and coating materials, the turn width W is an outer diameter of an outer shape of the stranded wires and coating materials.
10. The wireless charging system of claim 1 , wherein each magnetic coil includes a printed circuit board or a flexible printed circuit board, the ratio of W/S is not larger than 5.
11. The wireless charging system of claim 1 , wherein each magnetic coil includes a printed circuit board or a flexible printed circuit board which comprises a trace clearance, the turn spacing S is a sum of the trace clearance and an added space in addition to the trace clearance.
12. The wireless charging system in claim 11 , wherein the turn width W is a width of a trace.
13. The wireless charging system of claim 1 , wherein the magnetic coil has one or more layers of coils.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
November 1, 2017
December 29, 2020
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